In CrossFit workouts, there's an insanely challenging gymnastics move called toes to bar that I can't seem to master (even though it's been over three years!). I recently signed up for an adult gymnastics class to improve my skills and was excited the coach had us work on these hanging L-sit holds (also called, more simply, hanging L-holds). It's not only a great exercise to strengthen the core for parallel bar work, but I know it'll also help get me closer to conquering the mighty toes to bar.